Cooling system and method for electric rotating machine

Abstract

An electric rotating machine includes a machine housing having a mixed condensation chamber, a rotor accommodated in the machine housing, and a stator accommodated in the machine housing in adjacent relationship to the mixed condensation chamber. A cooling device includes a first assembly to expose at least a part of the stator and/or the rotor to a vaporization coolant which vaporizes when contacting the part so as to effect a vaporization cooling, and a second assembly to dispense a liquid condensation coolant into the mixed condensation chamber for contacting the vaporization coolant so as to effect a mixed condensation of the vaporized vaporization coolant with the liquid condensation coolant in the mixed condensation chamber.

What is claimed is: 
     
       1. An electric rotating machine, comprising:
 a machine housing having a mixed condensation chamber; 
 a rotor accommodated in the machine housing; 
 a stator accommodated in the machine housing in adjacent relationship to the mixed condensation chamber; 
 a cooling device including a first assembly configured to expose at least a part of the stator and/or the rotor to a vaporization coolant which vaporizes when contacting the part so as to effect a vaporization cooling, and a second assembly configured to dispense a liquid condensation coolant into the mixed condensation chamber for contacting the vaporization coolant to effect a mixed condensation of the vaporized vaporization coolant with the liquid condensation coolant in the mixed condensation chamber; and 
 a separator in the form of slotted partition plates, deflection plates with fabric, or as a filler body arranged on a side of the mixed condensation chamber in facing relationship toward the stator to delimit the mixed condensation chamber from the part, 
 wherein the mixed condensation chamber is delimited from the stator and the rotor by the separator, so that only a gaseous coolant flow of the vaporization coolant flow flows into the mixed condensation chamber. 
 
     
     
       2. The electric rotating machine of  claim 1 , wherein the first assembly is a spray device to generate a coolant mist, when dispensing the vaporization coolant. 
     
     
       3. The electric rotating machine of  claim 2 , wherein the spray device is an atomizing device. 
     
     
       4. The electric rotating machine of  claim 3 , wherein the atomizing device comprises a full cone nozzle. 
     
     
       5. The electric rotating machine of  claim 1 , wherein the second assembly is a spray device to generate a coolant mist, when dispensing the condensation coolant. 
     
     
       6. The electric rotating machine of  claim 5 , wherein the spray device is an atomizing device. 
     
     
       7. The electric rotating machine of  claim 6 , wherein the atomizing device comprises a full cone nozzle. 
     
     
       8. The electric rotating machine of  claim 1 , wherein the second assembly for mixed condensation is at least partially arranged in the mixed condensation chamber. 
     
     
       9. The electric rotating machine of  claim 1 , wherein the second assembly includes a heat exchanger arranged in the mixed condensation chamber. 
     
     
       10. The electric rotating machine of  claim 9 , wherein the heat exchanger is embodied as a pipe bundle heat exchanger or plate heat exchanger. 
     
     
       11. The electric rotating machine of  claim 1 , wherein the second assembly includes the filler body arranged in the mixed condensation chamber. 
     
     
       12. The electric rotating machine of  claim 11 , wherein the second assembly includes a heat exchanger arranged in the filler body. 
     
     
       13. A method for cooling an electric rotating machine having a machine housing for accommodating a stator and a rotor, said method comprising:
 cooling at least a part of the stator and/or rotor of the electric rotating machine using a vaporization coolant via vaporization cooling, thereby converting the vaporization coolant to a vaporized phase; and 
 transferring the vaporized vaporization coolant back into a liquid phase with the aid of a liquid condensation coolant via mixed condensation in a mixed condensation chamber in adjacent relationship to the stator inside the machine housing, 
 wherein a separator in the form of slotted partition plates, deflection plates with fabric, or as a filler body is arranged on a side of the mixed condensation chamber in facing relationship toward the stator to delimit the mixed condensation chamber from the part of the stator and/or rotor, 
 wherein the mixed condensation chamber is delimited from the stator and the rotor by the separator, so that only a gaseous coolant flow of the vaporization flow flows into the mixed condensation chamber. 
 
     
     
       14. The method of  claim 13 , further comprising spraying the vaporization coolant such as to generate a coolant mist onto the part. 
     
     
       15. The method of  claim 13 , further comprising spraying the condensation coolant at least partially into the mixed condensation chamber to thereby form a coolant mist. 
     
     
       16. The method of  claim 15 , wherein the condensation coolant is at least partially sprayed onto a heat exchanger. 
     
     
       17. The method of  claim 15 , wherein the condensation coolant is at least partially sprayed onto a pipe bundle heat exchanger and/or a plate heat exchanger. 
     
     
       18. The method of  claim 15 , wherein the condensation coolant is at least partially sprayed onto the filler body.